Driving and control mechanism



July 23, 1946. a. B, HIRSCH 2,404,439

DRIVING AND CONTROL MECHANISM Filed July a1, 1945 4 Sheets-Sheet 1 July23, 1946. G. B. HIRSCH DRIVING AND CONTROL MECHANISM Filed July 51, 19434 Sheets-Sheet 2 Jilly 1946- e.- B. HIRSCH 2,404,439

DRIVING AND CONTROL MECHANISM Filed July 51, 1943 4 Sheets-Sheet 3 July23, 1946. v G. B. HIRSCH 2,404,439

DRIVING AND CONTROL MECHANISM Filed July 51, 1945 4 Sheets-Sheet 4 5 PINOLE. MOTOR PUMP MOTOR T.4 BLE Mo'rag v 6 I s PINDLE DIRECTION Wizfness QI fa 4 Patented July 23, 1946 UNITED A s; P L; o I l 2,404,439,. l i aeiv se@ PQW WE AM M,= George B.-Hirsch, Providence, R. I. ,1lassign0rt0[Brown (and ZESh'arpe Manufacturing Company; acorporation of-Rhode Islandp i ipn ew 1.

15 Claims.

The present inventionfrelates to driving and 1 control mechanisms.

The' invention i'sherein disclosed in a preferred form as embodied in a'milling machine 'of' the general typehaving a rotary milling cutterspiniile and a work supporting assemblyinclucling a longitudinally'reciprocable" table and a transversely movablesagldle support;The driving connec m 'r" W t1$ rnrt g'aswm ly qm rii e an electricmotor, feed "and quick traverse gear trains continuously driventherefrom, a feed} quick traverse 'clutch shiftable between an"intermediate neutral position 'ancl alternative) feed and quick traversepositions, and, "branch; line 1 transmissions therefrom for driving each'of the several supports. 'A'n ;in'dividua1 electric motor havingappropriate driving connections therefrom is pro'vided'for driving themilling cutter For controlling the operatipnyof the 1 machine, anelectrical control system'is prqvided" which operates through' theagency of "switch I connections tbfstart 'and stop the spindle and worksupport assembly motors; The feed-quieli* traverse clutch is constructedand arrangedfto '25 system in connection with thestarting and stoppingof;the driving motors for the tool angilwork spindle.

be" operated "by means of the electrical "control supports. r i

It isa principal objector the invention to provide jajnovel and improvedmechanism "for con-'9 trollin ithe operation of the ,ieed-quiclrtraverseclut'chin 'ajmachine of this gene lv iisascription.

More specifically," it is an object of the invention to provide a'novelandf'i'mproved power operated shifting mechanism for thelclutch which iscon:-

structed and arranged. to be readily controlled by electrical means forshifting the clutch from any one to. another, of'its' feed'jand quiclitraverse clutching and intermediate neutral l 'po's itions Iti'sa'furth'er' obje'cti'ofthe invention tolprovide a: power operated,electrically f controlled; shifting mechanism of the general typedescribedf for a feed-quick traverse clutch'which is par-mu:

, larly adapted for use in a milling maem e having electrically operatedand controlledfp'owe'r driving means for the Work supportingfassemblyand.

niil li n'g"cutter.spindle-tojcause the clutch to be shifteda;lltorhatically, fr'onrr either the. feed or I0 thefn' ower is shut'ofi inforderjto prevent possible coasting; oi the work support with themilling quick; traverse r nin pos ion to ut al r. to bringfthe workjsupport to aquick sto whenever uttei t theimaqhi e stationa y.

With. these and other objects in view as may hereinaf i t ppearl aiatvrie ime; g

19 3, er akNo-aeessx,

a series of shift earn surfaces'ioimed-"on th'ez pi "shiftableandrommbie'eiu cn shifting at one endthereo'f'a pair of Gluten shift'ingfingersf arranged'to be brought into different-operative; positions withrelation to the Shifting*ca r'ns -by" rockin movements "imparted {to therod "to "shift-f the rod and ciiitehax alljfrtm Line to another a said:positiens, and. electricallyoperated me including" solenoids forcontrolling the angular iti n we shift ro'd In accordance withan toavoid possible iriterf erence of-th i al qlii' l reip ie s im f new o"ce l. or a shi t n n b fiee i 9?? the w-@ 11 ayersei uw i mmm a q 'hesfi e i' nterme i te al 1 pull exertedPloy the "electrical operative tofcontinue the rocking intvem'e'n' the shifft rod to the alternate extremeposition, so" that cooperating "withrelatioritoits actuating cams 0'"nue theaxial shifting movemientsi ot the ski tf dance with fano herfeature of the in pcsit'e; faces of a Ia geunv-m'; gear continuouslydriven from the support driving motor anagram" I Y 7 'ther feature'pfthe invention, a mechanism is pr'ovided for" positivelycontrolling theangular movement eith'e shiftrdd certain conditions as,fo r when thelec'i 5 r This'rr echanisn coinpiiisesan 1 rface n hei'sh i q iwhic 'ief ee dii i oug v liernail-rel er n T t e e I a 3 and feed and quicktraverse positions, and also serves automatically to engage thebrakewhen the clutch is shifted to the neutral position.

The several features of the invention consist alsq in the devices,combinations and arrangement of parts hereinafter described and claimed,

killed in the art from the following description taken inconnection'with the accompanying drawings, in which Fig. 1 is a somewhatfragwhich together '.vf ith theadvantages to be ob-u tained thereby willbereadily understood by one S 60, and a control collar 68 slidable onthe sleeve member 66 in either direction from the neutral I positionshown in Fig. 2, to limiting positions in each direction in which thefeed and quick traverse driving clutch elements are operativelyconnected. The shaft 60 through which the drive I is taken from theclutch has rigidly secured thereto a gear III which meshes with a gearI2 on shaft 52 which in turn meshes with a gear 14 secured on arearwardly extending splined drive shaft I6 through which the drive istransferred mentary view in front elevation showing a pori tion of thework supporting assembly of a mill-i ing machine, a portion of thecasing being broken away to illustrate particularly the driving contothe saddle support 32 of the machine. The

. drive is taken from shaft I6 through a bevel gear nections for thetable and saddle supports; Fig.2

is an enlarged detail view partly in section illus"- tratingparticularly the feed-quick traverse clutch and the shifting mechanismtherefor; Fig. 3 is a 'viewlooking from the left of Fig. 2, butonasmaller scale, illustrating particularly the solenoid for controllingthe operation of the feedquick traverse clutch. shifting mechanism andthe mechanical brake associated with the feed-- quick traverseclutch;'Fig. 4 is an enlarged detail View illustrating particularly theclutch shift ing cams and fingersshcwn in 'Fig. 2, but with k the. partsin the quicktraverseposition; Fig. 5 is a View of the partsshown in Fig.4, looking from the right; Fig. 6 ;is a somewhat fragmentary view of theclutch shiftingfingers and cams looking I I8 .slidably supported on thespline shaft I6, and a bevel gear 80 on a horizontal shaft 82 in the}saddle support 32. meshes with a driving element 86 of a table re- Agear 84 on the shaft 82 versingclutch carried on a short supportingshaft 88. A gear 90 on the shaft 82 is connected through an intermediateidler gear (not shown) with areverse driving element 92 on the shaft Thedriven element of the reverser com-' 88. prises a clutch member 94supported for axial movement on the shaft 88 from the intermediateneutral position shown in Fig. l, into engage- -ment alternatively withclutch faces formed on the driving elements 86, 92 of the reverser; Thegear 96 formed on the driven clutch member 94 meshes with a clutchgear'SS which is carried in the direction of Fig. 4, but with the parts7 in the feed position; Fig. 7 is a View of the parts shown in Fig. 6,looking from the right; Fig. 8 is an enlarged detai1 view partly insection taken on, the line 8-8 of Fig. 1, illustrating the clutchshifting fingers and cams in the neutral position; and Fig. 9 is awiring diagram of the machine illustrating the manner in which theclutch table III) is taken from an electric motor 38 hav ing an armatureshaft 40 and a pinion 42 mounted thereon for engagement with alargedriving gear 44 supported on a shaft 46. The variable speed feed drivefor the movable supports is taken from the shaft 46 through a system ofa change speed gearing indicated generally in dotted lines in Fi 1,carried on a series of supporting shafts 48, 59 and 52, terminatinginge'ar's 54, 56 (see Fig. 2), which form an integral part of the feeddriving element 58 of a feed-quick itraverse clutch supported on a'shaft 60. The quick traverse drive for the movable supports is takenfrom the gear 44 through a pinion'62 loosely supported to turn on thesupporting shaft 60,

and forxning an integral part of the quick trav-' erse driving element64 of the feed-quick traverse clutch. The feed-quick traverse drivingclutch? of the present machine is of a standard construction availablein the market, and is illustrated ,generallyeas including the feed andquick trav- Ierse driving elements-58 and 64 0f the clutchja sleevemember 66 which is identified as the driven element secured to turn withthe supporting shaft by a shaft I60 which also carries clutch gear I02for power driving the table. .The gear I02 meshes with a'ge'ar I04formed on the driving nut I06 of a feed screw and nut drivingconne'c- Inthe illustrated form'of tion for the table. 7 the invention, the feedscrew I08 is of the'nonrotating type, being rigidly secured to the work1 table, and the nut I06 is externally supported on,

the saddle support against 7 movement axially I with the table.

, the provision of a novel power actuated shifting.

A feature of the present invention'consists in mechanism for shiftingthe feed-quick traverse clutch which is particularly adapted and.arranged to be controlled through the agencyof electrical devicesincluding solenoids. The shifting mechanism for the clutch comprises ashifting fork II2 which engages in an annular groove H4 formed in thesliding collar 68 above "de- 3 scribed, and is carried on an axiallyshiftable control rod I Iii. The shiftingfork I IZ is'sup-j, ported onthe control rod between a shoulder I.IB and a collar I20 for movementaxially as a unit therewith. The control rod'is supported adjacent oneend in a bearing I22 formed in the machine frame, and at its other endwithin a sleeve element I24 which is externally supported for rotationalmovement in a bearing I26'formed in I V a fixed portion of the machine.The control rod I I6 is keyed to be rotated as a unit with the sleevemember I24, and to move axially'with relation thereto,-by means of a keyI28 in the control rod which engages with a corresponding keyway in Ithe sleeve element I24.

In accordance with the invention, the control rod H6 is provided at oneend with a pair of clutch shifting fingerswhich are arranged to be actedupon by'means'of shift cams formed on the two faces of the main drivinggear 44." The a"; operation of the fingers and cams associated therewithis controlled by imparting rocking movements to the control rod IIBwhich serve to position one or the other finger in position to cause thecams engagingtherewith to posi-" :'tively shift theclutch from one toanother of thealternative neutraLfeed and quick traverse drivingpositionsrz. 'Iheirotationali movements 1013 f thatcontr'ol .rod I I6laree'ini'turn controlled by"? means of solenoids: and a centeringspring. sysatemxwhicniacts onlthe rotatable sleeve I24 pre-s viou'slydescribed. 1 -At .its:right'-ha-nd1end,; as shown in-Fig.;2,:the rod IIShas supported theree.

on a bracket I32; which. provides a supportfor two' clutch.ushiftingifingers .I34 and1,-.l36; The

finger I34is' rigidly supportedfin ja -receiving1:slot

I38l..by-.means oftscrews I40; and i's -;particularlyv adapted Ltdcooperate with=any-one of a ;ser'ies:of camelements l42 'formeduo n therightz handor.

outeriface ofrthe gear 44 as "viewed in Fig. .2;- The finger I 36 issimilarly;supportedi'in a' groove I44"for'med"on the left handor inner.face of the: bracket 1.32,:- andf'is held in. position thereon' by is:-particularly" arranged :to cooperate -with any.

one' of'a number of cams I 48 Lformedon the in-v I ner; face of:the-gear.44. Thezfingers I34;.I36

in addition to being-mounted at opposite faces of ferent operativeposition with-relation to itscam,

while theoth'erof said fingers is moved. upward- 1y. to awwholly;disengaged inoperative position.

Asbest shown in 8 of the drawings, each of thefingers" I34; I36'is.provided with two; outwardly stepped cam engagingsurfaces'the -fin-. gerI34 being'provided with an'outwardly disposed 1 cam engagingsurface. I53and an inwardly stepped camengaging surface I52, and the finger- I 36being similarly provided with an out-.- wardly disposed cam engagingsurface I54 and an additional inwardly stepped camengaging 'surfaceIES.Thesecam engaging urfaces of the shifting fingers are so constructed andarranged that for an intermediate or neutral angular position of thecontrol rod IIB as shown in Figs. 2 and 8, the utwardly stepped camsurfaces I53 and I54 respectively of thefingers I34, I36 are inoperativerelation to their respective cams I42- and I48. For this position of theparts,it will readily be seenthatthecontrol rod; I I6 is positivelyhel'dinthe intermediate neutral position illustrated in Fig. 2. Assumingthat thecontrol rod' [I6 is now rocked in "a clockwise direction to theposition" shown in 5; the inner orjleft' hand shifting fingerI36'1is'movedupwardly'to a fully 'inoperative'position in which it isoutside the p'eriphery of the driving gear 44, while at the same timethe finger I34 is moved downwardly so'that the inwardlystepped camengaging surface I52 is brought into the path of movement of'the camsI42, causing the finger I34 and theb racket I32"'o'n which it is mountedand the control rod I I6 to'be shiftedbodily to the right, as shown inFig-i 4; to shift the feed-quicktraverse clutch to the quick traverseposition; This is alsothep'osition shown-in dottedlines in Fig. 8. Whenthe control rod H6 is a'gainrocked to its-intermediate or neutralposition, the'inner stepped surface I52-is "shifted out of'the path-of"movement of the cams" I42, and the 1owerorouter stepped surface I54 ofthe finger I36 is moved into'thepathof its cooperating cam. I484; tocausethefinger assembly, control rod H6 and.

stepped surface IE6 is brought into the path of 4 movement. of thecooperating cams I48,:thus; cansing the clutch to be moved tothe-feedaposition.

sleevezmember I24 to which the controlrod I I6 2011115 keyed, isprovided on its rear face with an.

eccentric pinI6fl to which is connected; the armature. shaft i [62 0f adouble actingsolenoid 64; The solenoid isprovided with two coils I66.

and I68 which are arranged to be alternatively ,;energized to causethearmature shaft IEZ-to be shifted either. upwardly or downwardly asdesired from theintermediate position illustrated in Figs.2 and3, tocorrespondingly rock the con,-

trol rod H6. The solenoid is secured to a'plate o..br.acket I1u.pivota1ly. supported atits lower end follow thecancuat eymovement ofthe-connecting pint. I160;

supportingrodlfli which is slidably supported intermediate its lengthwithin a collar. I18 supported on a laterally extending pivot pin I80 onthe machine frame. Centering springs I82 and I84 coiledgabout the rodI16 and engaging between opposite sides of the collar I18 and.cooperating abutments on the rod I16, tend at all times.

to return the control rod I I6 to itsintermediate inoperative position.

Under certain conditions of operation, it is.lre-. quently desirable toshift the feed-quick traversev clutch directly from one to. the otherclutching position. Assumingthat the. solenoid I68 is en-. ergized andthe. shifting finger I34.is depressed so that the control rod II 3 isinthe quick traverse position asshown in-Figs. 4 and 5, it may, for ex.-vample, be desired to. tie-energize the solenoid I63 and to energize thesolenoid I66 to shift the 55' clutch to the feed position. Withthe partsin the position of. Figs. 4 and 5, and as; shown in dotted lines in Fig.8, an immediate rocking of the control rod I I6 to the alternate feedposition would have the effect of moving the feed shifting 0 finger. I36downwardly into interfering engagement with the main driving gear 44Withconser; quent breakage of the parts. In order to avoid thiscontingency, a safety device is provided which .acts positively toprevent rocking moVe-- 6 ment' of the control rod H6; and shiftingfingers I34, I36 beyond the intermediate position until after thecontrol rod II 6 and associated parts.

in...Figs'...6. and 7.. The, m.echanis m-; forpositiyely; controlling;the rockingmovementzofg.12118219511115? to -.move the shifting finger I34-:to -,a.. fu1lyraised inoperative position, and at,.' the;;sametime;to move thefinger I 36 downwardlysothat theinner, 1

A return rocking, movementof-the control rod H6 to its intermediateposition will causeothelower .orputer stepped surface I58 of theshift-L. -,1o;!ing finger. I34 to be broughtinto the-path of; movementof. it'sycooperating cams I42 to return theyclutch tov the intermediateneutral position..

Further in accordance with the present inven-W tion,.the angularposition of the control. rod- Hi6. 15,.to--determine the setting of thefeed-quickltrav erse sclutchf is arranged :to be controlled; entirely}.by means of electrically operated means. As best. shown .in Figs..2;,and3 of .the drawings thd on apivot pin.I12, soqthat-the upper endflof thesolenoid andtheta rmature I 62-are permitted .to.

The sleeve member I24 is, provided 5I=also with a laterally; extendingarm to which" isconnected the upperend of a centeringspring mechanicallybrake the comprises the collar I20 rigidly secured to the control rod II6 which is squared off to provide-on its underside an engaging surfaceI86 for'engagee j ment'with' two-pins I88 and I90 formedv on a.

lateral extension I92 of a machine supporting frame. The'pin-s I89, I90are spaced atopposite: sides of the control rod H6, and are disposedalso axially with relation to one another along the have no shaft.

such as togperrnit movement of thejcontrol rod in 2 its jrockedpositionaxially to thequick traverse position as shown in Figs. 4 and 5.Ifthe-electricalgoperating connections of the machine are now shifted tothe alternate feed position, the pin I90 will, act in engagement withthe surface Ito.

of the collar I26 as indicated in Fig. 4, to prevent anyrocking movementof the control rod I25 beyond the intermediate neutral position. As.the.

control rod I I6 is'now returned to its intermediate position as abovedescribed, the surface I89 of thecollar I ride out pin I90, thus ofengagement with. the permitting the controlrod II6 to be rocked to thealternate feed positiomand to be shifted axially thereto, as indicatedin Figs; 6 and'l. v

. With the present construction, a braking and detent mechanism isprovided which serves to maintain the clutch controlrod yieldably ineach, of its neutral and quick traverse positions and isrenderedoperative upon the shifting of the feedquick traverse clutch toits neutral position to parts driven therefrom. mechanism, as best shownprises a cone-shaped braking V ported on a sleeve member which alsocarries a disk I96,.,these parts being keyed to turn with and to beaxially movable upon the driven shaft 80. -A compression spring I98coiled about the shaft to between the brake disk I96 and a collar 2110tends normally to move the brake into its engaging position. A shiitingfork 202 pivotally suspended from a pivot pin 204 engages with a faceof. the disk I96, and is in turn acted upon a control lever 206supported to turn on a pivot 208, and provided with an upward extensionand an adjustable stop screw 2I0 for engagement therewith. The controllever 265 is provided at its outer end with a V-shaped projection 2E2 jfor engagement with any one of three V-shaped notches formed in a sleevemember 2M which. is

pinned to the sleeve hub of the clutch shifting fork II2 axially as aunit therewith. In the in termediate or neutral position of the clutch,the control rod I16 and associated parts, the V- shaped member 2 I 2 isengaged within a relatively driven shafit 60 and the. Thebrakinganddetent in Figs. 2 and 3, com-; member I94 supwork support is being movedinto position at large V-s haped groove 2H5 in the sleeve 2M, permitting the control lever 266 to be rocked down- 1 wardly sufficientlyso thatthe brake I94 is engaged under the influence of its spring: 1556.Movement of the control rod I I6 in either direction to the clutchingposition, cause the follo'wer 2I2 to ride onto a high portion of theperiphery of the sleeve 2I4 where it is engaged in one of two shallowV-shaped grooves 248, 220, so that the brake I94 is disengaged, and thecontrol rod and associated parts will be held yieldably in the clutchingposition. 1 r

The operation of the electrical control system of the machine forcontrolling the operation of;

the feed-quick traverse clutch will be readily understood from aninspection'of Fig.9 of the draw-ii ings', in'which is illustrated theelectricalxdia gram: of aisystem'suitable for a milling. machine havinga table driving motor 38, a pump motor; and aspindle motor for drivingthe millingcut ter spindle of 'themachinel The feediand. quick traversesolenoids I66,-.I68 are indicated at the bottom of Fig. 9, and are shownin a circuitwhich includes the contatlTIB-B. This contact is-in turhcontrolled by means of a relay 'T; In the V eventthat the table is'to beoperated atv the feed. rate,ithe closing of 'a' starting switch contactn -6, and either the right or left directionalirelay' switch contact B8,willcausethe relay T to :be

energized'to close contact TI 95 so that solenoid I66 marked Feed willbe energized, causing the respectively, is normally biased tothe feedposi-' tion illustrated in Fig. .9 by spring means actingv on. therespective switches so thatrthe energizing of the relay T only isrequired to shift the ieedquick traverse clutch to the'feed posi" tion;In the event that movement of .the sup;

portis to be continued at the quick traverse rate,

the pressing' of anyone of the quick traverse switches. designated QTand shown in the lower.

portion of diagrammatic Fig. 9; will cause the designated switch contactI--I6, I6-I'I or II-'I8 to be opened, thus de-energizing the feed clutchsolenoid I66,and will .cause 'the corresponding one'of the switchcontacts 4-2I; to beiclosed, energizingthe quick traverse clutchsolenoid I68;

In the event that the machine is tobe jogged at quick traverse with thespindlemotor stopped,

the pressing of one of the QT switches above noted will act in a similarmanner to establish a circuit through the quick traverse solenoid I68.

In this case, a circuit is established through connection 8 to energizethe relay T and to close the switch contact TI95. I 7

Assuming that the machine is operating at *quick traverse but withswitch L or R closed and the spindle :motor running, when the quicktravsolenoid I66 is closed to again shift the quick feed traverse clutchthrough the neutral position to thelfeed position. If,'on the otherhand, the

quick traverse, as above suggested, 'with the spindle motor not running,so that the switch 7 contacts R68 .and L8-8 are both open, the

release of the quicktra-verse switch will have the 'elf ect also ofde-energizing solenoid T, thus opening switch contact TI9--5. Since"both the feed and quick traverse solenoids I66, I68 are nowdeenergized, the feed-quick traverse clutch returns to the neutralposition, as above set forth.

Assuming that the support is traveling at the feed rate and that it, isdesired to stop the machine, one of the switches marked Stop on thediagram ispressed, causing'the'entiresecmuch as thegentirersecondarycircuit is now disconnected, the. feed. solenoid. I66 ,is .deeenergizedand the "power operated shift mechanism: bee;

comes operative to return the clutch'to' the neutral' position to stopthe machine.

It will be understood that the-examples above means, if so desired.

The nature and scope of the invention having wfingers tovcausewtheclutch to be shifted Selec- 'tively fromany onetoanother of said neutraland clutching, positions. V

' 4. A driving and control-mechanism for a ma- 5;chinetool-"supportwhich-comprises power drivging. connections, fordriving the; support" alteri-nati-velwat feed and quick traverse ratesincluding .a feed and quick traverse clutchhaving neutralw; and 1alternative ",feed and quick traverse i10 clutching positions; andcont-r01 means therefor comprising an I axiallymovable 'clutchj 2 shi-fting rod,- a continuously rotating cam havingzits rotational; axisparallel .withthat ;of -;the,= shift; rod, and having cam-surfaces"diSPOSGdi'Ql'l opposite been indicated and a machine embodying the '15faceswhereoffiand'followerimeansfcomprising a several features'o-f thepresent invention having been specifically described, what is claimedis:

1. A driving-and control mechanism for a machine tool support whichcomprises power'driving connections for driving the support 'alternatively at feed and quick traverse'rates including a' feed-quick traverseclutch having neutral and alternative' feed and quick traverse clutchingpositions, and'control means therefor comprising clutch shifting means,a continuously rotating .25

cam element having operating'surfaces co-acting with said clutchshifting means to shift the clutch "in-opposite directions, followermeans connected with said clutchfshifting means having follower surfacesarranged to be acted upon selectively by 3 said operating.surfacescxfor. shifting the clutch,

' andsmeans forl'shifting the follower surfaces and 1" operatingsurfaces relatively to cause selected'follower and operating surfaces toco-act selectively i l I gchinentool support WhIChlCOmPIISBS p0W1' dI'1Vpair-of shifting fingers-each having two cam ten-1gaging-surfaces;stepped;- outwardly with relation l'-. one:anothersupportedon said rod and arrangedat opposite sidesof therod axisto be acted 1: .upon, bysthe respective-cam surfaces; said 'fingersbeing arranged for one angular position-of the -rod -with-t-theouterstepped portions thereof in 1 rtherpath of-.the"respecti-veoperating surfaces to -maintain the rodcaxiallyinlneutral position, saidfingers :being; further-- arranged -so that for a rockedposition of'therod in either; direction from .saidaangulanposition, one of' saidfingers islo- .cated with the inner, stepped portion -thereof in soperative relation to its cooperatingcam surface 0 landltheotherof-saidfingers is wholly removed .fromiits cooperating camlsurface, andmeansfor .rockingithelshift rod in eitherdirectionto, and"fromlsaidneutralposition. Y y

. 5., A,drivingandicontrol mechanism for, a.ma-

with one another to shift the clutch from any 3.

one to another of said neutraland clutching positions.

2. Adriving and control mechanism for a machine tool support whichcomprises'power drivuingconnections for'driving the support alter-"natively at feed and quick traverse rates including a'feed-quick'traverse: clutch having neutral andzalternative feed and. quick traverseclutching positions, and contrlol'rneans therefor comprising clutchshifting means, a continuously rotating cam element havingoppositelydisposed operating surf-aces, followerineans' connected withsaid clutch shiftingmeans comprising ,apair of shift fingers shiftablefor engagement in a pluralit of i different operating relationsrespectivelywith said oppositely disposed operating surfaces forshifting I 3. A driving and control mechanism for-a machine tool supportwhich comprises power driving connections for driving the supportalternatively at feed and quick traverse rates including a feed-quicktraverse-clutch having'neutral and alternative feed and quick traverseclutching positions; and control means therefor comprising a clutchshifting member, a continuously rotating-'cam'element having camsurfaces disposed on opposite faces th'ereof, and follower meanscomprising a "pair-of shifting fingers associated with said clutchshifting 'member each having 'two 'cam' engaging surfaces steppedoutwardly with relation to one *another arranged to be acted upon bythe'respective operating surfaces, means I for controlling the positionof said fingers tomove one or the other of' said stepsof aselectedifinger .5 into the path of' movement of the cooperating ingconnections ion driving the support alternantivellbat feedmand quicktraverse rates including l a 'feedquick, traverse, clutch s havingneutral and alternative, ,feed and quick traverse-. ,clutching 40positions, and controlmeanstherefor comprising clutch shifting; means, 7a continuously rotating am elefment i havin opposit ly d sposed op rat-1 ing surfaces, follower= means" associated withtsaid 1 Clutch shi t nmeansarransedltq be a ted, up n I b s d inn rvat n sur asesiol'fihifnatheplutc and electrically operated. positioning devices including, asolenoid for, controlling the relation of; the follower me'ans'to theoperating surfaces tpjcause the clutch to be, shifted selectively fromany one to another of said neutral and clutching posit-ions.

KGQ'A driving and control mechanismfor a machine toolsupportwhichcomprises powerdriving connections for driving the'supportalternatively at feed and quick traverse rates including a feedquicktraverse clutchhaving neutral and alternative feed a'ndquick traverse"clutching positions, and* control means therefor comprising clutch"shifting means, a continuously rotating 7 cam element having oppositely'disposed' operat- 1 firig surfaces; follower-meansassociated with'said"clutch shifting'means comprising'a' pair of shift finge'rs arranged forengagement respectively with *said oppositely disposed operatingsurfaces for shifting" the clutch; and electricallyoperated positioningmeans for moving said fingers. se

' lectively into the path ofinovem'ent"of'the 'respec- 3 'tive'operatingfsurfaces'to cause-the clutch to be,

- shiftedtoone ortheotherpf said clutchingipositi'ons' 270 7;:A 'drivingand controlwmechanism foramachine tool support whichpomprises powerdriving connectionsforfdrivingth support'alternatively Jatifeed'andiquick traverse rates including a, feed and v. quick: traverse;clutch having; neutral. and :Icam, and means forishiftingthe position ofsaidi' 751z'aiternativej:{feeds and; quick e traverse clutching 13 otherof said neutral and clutching positions, and means for controlling theangular position of said shift rod.

13. A driving and control mechanism for a machine tool support whichcomprises power driving connections for driving the supportalternatively at feed and quick traverse rates including a feedquicktraverse clutch having neutral and alternative feed and quick traverseclutching positions, and control means therefor comprisin clutchshifting means, continuously driven operating means, follower meansassociated with the clutch shifting means arranged to be acted upon bysaid operating means for shifting the clutch, electrical operatingpositioning means acting when energized for controlling the relation ofthe follower means to the actuating means to cause the clutch to beshifted positively to one of said clutching positions, and yieldablemeans rendered operative by the de-energ izing of said electricalpositioning means for controlling. the relation of the follower means tothe actuating means to cause the clutch to be shifted positively to theneutral position.

14. A drivingand control mechanism for a machine tool support whichcomprises power driving connections for driving the supportalternatively at feed and quick traverse rates including a feedquicktraverse clutch having neutral and alternative feed and quick traverseclutching positions, and control means therefor comprising clutchshifting means including an axially shiftable and rotatable shift rod,continuously driven operating means, follower means associated with theshift rod arranged to be positioned with relation to said operatingmeansby rocking movement of the shift rod to shift the rod axially and theclutch therewith positively from anyone to an'- other of said neutraland clutching positions,

electrical means acting when energized to rock the shift rod to one ofsaid clutching positions,

and spring means rendered operative upon the de-energizing of saidelectrical means to rock said shift rod to the neutral position.

15. A driving and control mechanism for a ma. chine tool support whichcomprises power driving connections for driving the supportalternatively at feed and quick traverse rates including a feed- I quicktraverse clutch havingneutral and alterna- GEORGE B. HIR'SCI-I.

